depressions and anticyclones
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Junior Cert Geography, Slides on Depressions and AnticyclonesTRANSCRIPT
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Different Weathers: The Effects of Ascending and Descending Air
Chapter 11
Pages 65-71
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Definitions
Weather- condition of the atmosphere over a short time
Climate- average condition of the atmosphere over a long time
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Air Masses and Fronts
Air mass- large body of airFront- boundary between two air masses
Warm front- where warm air approaches coldCold front- where cold air approaches warm
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Ireland and Fronts
Ireland affected by Polar FrontCold air meets warm airWarm air invades section of cold airWarm air is light- rises- low pressure, called a
depression
Develop over Atlantic and move over Ireland
Weather: wet, windy
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Depressions and Anticyclones
Occur over mid latitudesDepression
Low pressureOval shapePressure lowest in the centre
AnticycloneHigh pressureOval shapePressure highest in middle
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A Depression on a weather map.
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Isobars – lines joining points of equal pressure
Isohyets – Lines joining points of equal rainfall
Isotherms – lines joining points of equal temperature
Isohels – equal sunshine
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Weather During a Depression
DepressionWeather
Cloudy Wet Windy
•Air Rises•Cools•Condenses- clouds
•Air Rises•Condenses•Falls as rain
•Isobars tightly packed•Blows towards middle
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Depression Anticyclone
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Anticyclones
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Weather During an Anticyclone
Anticyclone Weather
CALM CLEAR DRY
•Isobars widely spread•Winds blows outwards
•Air descends•Warms•Absorbs water
•No condensation•No rain
Temperatures
Summer- Hot
Winter- Cold
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2013 Junior Cert Higher Paper
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2008 Junior Cert – Higher Question
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2009 Ordinary Level Junior Cert
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The Make Up of a Depression
Warm sector and a cold sectorWarm front
Warm air rises over cold airIt cools, condenses and becomes rain
Cold frontCold air nudges under warm airAir rises, cools, condenses and rains
The depression is an area of low pressureWinds blow inwards
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2006 Junior Cert - OL
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2008 Junior Cert Paper